File:NGC1097 - HST - Potw2211a.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	14:21, 14 March 2022		7,418 × 3,943 (16.08 MB)	commons>Fabian RRRR	== {{int:filedesc}} == {{Information \|description={{en\|1='''Eye of the Galaxy This finely detailed image shows the heart of NGC 1097, a barred spiral galaxy that lies about 48 million light-years from Earth in the constellation Fornax. This picture reveals the intricacy of the web of stars and dust at NGC 1097’s centre, with the long tendrils of dust picked out in a dark red hue. The extent to which the galaxy’s structure is revealed is thanks to two instruments on the NASA/ESA Hubble Space...

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Source	ESA/Hubble
Credit/Provider	ESA/Hubble & NASA, D. Sand, K. Sheth
Short title	Eye of the Galaxy
Image title	This finely detailed image shows the heart of NGC 1097, a barred spiral galaxy that lies about 48 million light-years from Earth in the constellation Fornax. This picture reveals the intricacy of the web of stars and dust at NGC 1097’s centre, with the long tendrils of dust picked out in a dark red hue. The extent to which the galaxy’s structure is revealed is thanks to two instruments on the NASA/ESA Hubble Space Telescope: the Wide Field Camera 3 (WFC3) and the Advanced Camera for Surveys (ACS). The idea that a singleimage can be taken using two different cameras is not very intuitive. However, it makes far more sense after delving into how beautiful astronomical images like this one are composed. A helpful starting point is to consider what colour is, exactly. Our eyes can detect light waves at optical wavelengths between roughly 380 and 750 nanometres, using three types of receptors, each of which is sensitive to just a slice of that range. Our brain interprets these specific wavelengths as colours. By contrast, a telescope camera like the WFC3 or ACS is sensitive to a single, broad range of wavelengthsto maximise the amount of light collected. Raw images from telescopes are always in greyscale, only showing the amount of the light captured across all those wavelengths. Colour images from telescopes are indirectly possible, however, with the help of filters. By sliding a filter over the apertureof an instrument like the WFC3 or ACS, only light from a very specific wavelength range is let through — one such filter used in this image is for green light around 555 nanometres. This yields a greyscale image showing only the amount of light with that wavelength. This multicolour image of NGC 1097 is composed of images using seven different filters in total.
Usage terms	Creative Commons Attribution 4.0 International License
Date and time of data generation	06:00, 14 March 2022
Software used	Adobe Photoshop 23.0 (Windows)
File change date and time	17:15, 1 March 2022
Date and time of digitizing	11:59, 9 February 2022
Date metadata was last modified	18:15, 1 March 2022
Unique ID of original document	xmp.did:59ef006b-6ca1-0047-8289-678ea1e7a6b6
Keywords	NGC 1097
Contact information	https://esahubble.org ESA Office, Space Telescope Science Institute, 3700 San Martin Dr Baltimore, MD, 21218 United States
IIM version	4

File:NGC1097 - HST - Potw2211a.jpg

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